Chlamydia is a sexually transmitted infection that can cause serious health problems if not treated. It is common, and often goes undiagnosed. Here are five things you should know about Chlamydia: 1) It is easy to get. Chlamydia can be spread through sex, oral sex, or even contact with the urine or feces of an infected person. 2) It can lead to long-term health problems. Untreated Chlamydia can cause severe reproductive health problems, including infertility and even ectopic pregnancy. 3) It is very easy to prevent. You can avoid getting Chlamydia by using condoms every time you have sex, and by choosing partners who are also using condoms. 4) It is treatable.. If you get diagnosed with Chlamydia, your doctor will prescribe antibiotics to cure the infection.